Oscillatory phenomena observed in sunspot umbrae and penumbrae are reviewed and
critically discussed. A natural interplay between the thermal atmospheric stratification and …

The presence of magnetoacoustic waves in magnetic structures in the solar atmosphere is
well-documented. Applying the technique of solar magneto-seismology (SMS) allows us to …

We present results of investigations into chromospheric velocity oscillations in sunspots,
carried out at the Sayan Solar Observatory. It is shown that the “chevron” structures in the …

We find that oscillations of the LOS velocity in Hα vary within facula regions. The power
spectra show that the contributions of low-frequency modes (1.2–2 mHz) increase at the …

Oscillation properties in two sunspots and two facular regions are studied using Solar
Dynamics Observatory (SDO) data and ground-based observations in the Si i 10827Å and …

The differences between physical conditions in solar faculae and those in sunspots and
quiet photosphere (increased temperature and different magnetic field topology) suggest …

The nature of the three-minute and five-minute oscillations observed in sunspots is
considered to be an effect of propagation of magnetohydrodynamic (MHD) waves from the …

Based on the data from the Vostok station, Antarctica, for the period from 1966 to 1971, the
frequency modulation of the serpentine-emission-type (SE) geomagnetic pulsations is …

We analyze the oscillations of the H α profile width based on our observations of the
chromosphere at the base of solar coronal holes. The maximum oscillation amplitude …

Spatial distributions of the dominant oscillation frequency obtained for four sunspots show a
feature shared by all the analysed levels of the solar atmosphere in these sunspots. This …